Acoustics

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Appendix A: Equivalent Circuit Parameters

Name	Electrical Equivalent	Mechanical Equivalent	Acoustical Equivalent
Voice-Coil Resistance	$R E$	$R_{ME} = \frac{(Bl)^2}{R_E}$	$R_{AE} = \frac{(Bl)^2}{R_ES^2_D}$
Driver (Speaker) Mass	See $C M E C$	$M M D$	$M_{AD} = \frac{M_{MD}}{S^2_D}$
Driver (Speaker) Suspension Compliance	$L C E S = (B l) 2 C M S$	$C M S$	$C_{AS} = S^2_DC_{MS}$
Driver (Speaker) Suspension Resistance	$R_{ES} = \frac{(Bl)^2}{R_{MS}}$	$R M S$	$R_{AS} = \frac{R_{MS}}{S^2_D}$
Enclosure Compliance	$L_{CEB} = \frac{(Bl)^2C_{AB}}{S^2_D}$	$C_{MB} = \frac{C_{AB}}{S^2_D}$	$C A B$
Enclosure Air-Leak Losses	$R_{EL} = \frac{(Bl)^2}{S^2_DR_{AL}}$	$R_{ML} = S^2_DR_{AL}$	$R A L$
Acoustic Mass of Port	$C_{MEP} = \frac{S^2_DM_{AP}}{(Bl)^2}$	$M_{MP} = S^2_DM_{AP}$	$M A P$
Enclosure Mass Load	See $C M E C$	See $M M C$	$M A B$
Low-Frequency Radiation Mass Load	See $C M E C$	See $M M C$	$M A 1$
Combination Mass Load	$C_{MEC} = \frac{S^2_DM_{AC}}{(Bl)^2}$ $= \frac{S^2_D(M_{AB} + M_{A1}) + M_{MD}}{(Bl)^2}$	$M_{MC} = S^2_D(M_{AB} + M_{A1}) + M_{MD}$	$M A C = M A D + M A B + M A 1$ $= \frac{M_{MD}}{S^2_D} + M_{AB} + M_{A1}$